LP3853ES-1.8 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LP3853ES-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 1.8V output at 3A maximum current in a TO-263 (DDPAK-5) surface mount package. The main part number is currently in Last Time Buy status with 1213 pieces in stock. Substitute parts are necessary when the primary part reaches end-of-life, when alternative packaging formats are required, or when sourcing from different manufacturers becomes advantageous for supply chain continuity.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	3A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.6V @ 3A
Quiescent Current (Iq)	4 mA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-263 (DDPAK-5)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LP3853ES-1.8 is determined by the following critical parameters:

Fixed output voltage of 1.8V
Maximum output current of 3A
TO-263 (DDPAK-5) package compatibility
Surface mount mounting type
Operating temperature range of -40°C to 125°C
Enable control feature
Over Current, Over Temperature, and Short Circuit protection

Parts are grouped into two categories: direct Texas Instruments equivalents within the LP385x/LP386x/LP387x series, and cross-manufacturer alternatives from Microchip Technology. All substitute parts maintain identical output voltage and current specifications. Variations in quiescent current, dropout voltage, and PSRR performance are noted where applicable.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 3A	Iq (mA)	Product Status	Package	Inventory
LP3853ES-1.8	Texas Instruments	1.8V	3A	7V	0.6V	4	Last Time Buy	TO-263 (DDPAK-5)	1213 Pcs
LP3853ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	0.6V	4	Active	TO-263 (DDPAK-5)	1403 Pcs
LP3856ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	0.6V	4	Active	TO-263 (DDPAK-5)	1017 Pcs
LP3873ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V	9	Active	TO-263 (DDPAK-5)	825 Pcs
LP3876ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V	5	Active	TO-263 (DDPAK-5)	1506 Pcs
LP3966ES-1.8/NOPB	Texas Instruments	1.8V	3A	7V	1.2V	9	Active	TO-263 (DDPAK-5)	1226 Pcs
MIC39301-1.8WU-TR	Microchip Technology	1.8V	3A	16V	0.55V	Not specified	Active	TO-263 (DDPAK-5)	991 Pcs

Engineering Selection Recommendations

For applications requiring direct replacement of the LP3853ES-1.8, the LP3853ES-1.8/NOPB is the primary choice. This part is electrically identical, maintains Active product status, and offers higher inventory availability (1403 pieces). Both parts are ROHS3 compliant with identical electrical performance.

The LP3856ES-1.8/NOPB provides an alternative within the Texas Instruments LP385x family with identical electrical specifications and Active status. This part is suitable for direct substitution where supply of the LP3853ES-1.8/NOPB is constrained.

The LP3873ES-1.8/NOPB, LP3876ES-1.8/NOPB, and LP3966ES-1.8/NOPB are parametric equivalents with higher dropout voltages (1.2V versus 0.6V) and increased quiescent current. These parts are suitable only for applications where the higher dropout voltage and increased power dissipation are acceptable.

The MIC39301-1.8WU-TR from Microchip Technology is a cross-manufacturer alternative with superior input voltage rating (16V versus 7V) and lower dropout voltage (0.55V). This part is recommended for applications requiring higher input voltage tolerance or lower power dissipation. All substitute parts maintain ROHS3 compliance and identical TO-263 (DDPAK-5) package compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP3873ES-1.8/NOPB replace LP3853ES-1.8 in all applications?

A: LP3873ES-1.8/NOPB is a parametric equivalent with higher dropout voltage (1.2V versus 0.6V) and increased quiescent current (9 mA versus 4 mA). Substitution is valid only if the application can tolerate increased power dissipation and the higher dropout voltage does not violate minimum input voltage requirements.

Q: What is the difference between LP3853ES-1.8 and LP3853ES-1.8/NOPB?

A: Both parts are electrically identical. The /NOPB suffix indicates lead-free plating (no lead/no PbF). LP3853ES-1.8/NOPB is in Active status with higher inventory, making it the preferred choice for new designs.

Q: Is MIC39301-1.8WU-TR a direct replacement?

A: MIC39301-1.8WU-TR is functionally equivalent with identical output voltage and current specifications. It features a higher maximum input voltage (16V versus 7V) and lower dropout voltage (0.55V versus 0.6V). The part is pin-compatible in TO-263 (DDPAK-5) package and suitable for direct substitution where Microchip sourcing is preferred.

Q: What is the significance of the /NOPB designation?

A: The /NOPB suffix denotes lead-free plating and RoHS compliance. All listed substitute parts carry this designation or equivalent RoHS3 compliance certification.

Q: Can I use LP3876ES-1.8/NOPB instead of LP3853ES-1.8?

A: LP3876ES-1.8/NOPB is a parametric equivalent with higher dropout voltage (1.2V) and moderate quiescent current (5 mA). Substitution is valid if the application tolerates the increased dropout voltage and associated power dissipation.

Q: Why does MIC39301-1.8WU-TR have a higher input voltage rating?

A: The MIC39301-1.8WU-TR is designed with a higher input voltage specification (16V maximum). This provides greater design margin in applications with variable input voltage sources, though the 1.8V output and 3A current specifications remain identical to the Texas Instruments parts.

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